The Jinton is known for annihilating anything. Already when touching it, you get annihilated, that was illustrated often. when madara touched the jinton of oonoki, his arm was annihilated. So what if oonoki uses the jinton as a shield? for example a attack reaches you. you create a form of jinton like a shield and the technique that touches the jinton will get annihilated. or he shots a jinton beam against the technique. the jinton seems to have many form. geometric figures, beams, spears, etc. so hinton can be used to counter any attack. chibaku tensei, you will shot a beam that will pierce the whole chibaku tensei and annihilate the core. bijudama, you shot a beam against it or somehow protect urself.
The diameter of that jinton easily concealed oonokis bdy by far. Intead of using a beam, he could just create a geometric jinton form in form of a plate of the same size and any attack whether physical or ninjutsu that touches it will be annihilated.
here madara only touches the jinton and gets pulverized.
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